fix(cpus): workaround for Neoverse N2 erratum 2743089
Neoverse N2 erratum 2743089 is a Cat B erratum that applies to
all revisions <=r0p2 and is fixed in r0p3. The workaround is to
insert a dsb before the isb in the power down sequence.
SDEN documentation:
https://developer.arm.com/documentation/SDEN1982442/latest
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: Idec862226bd32c91374a8bbd5d73d7ee480a34d9
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index e56eac1..9311420 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -574,6 +574,10 @@
CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in
r0p1.
+- ``ERRATA_N2_2743089``: This applies errata 2743089 workaround to Neoverse-N2
+ CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed
+ in r0p3.
+
For Cortex-X2, the following errata build flags are defined :
- ``ERRATA_X2_2002765``: This applies errata 2002765 workaround to Cortex-X2
diff --git a/lib/cpus/aarch64/neoverse_n2.S b/lib/cpus/aarch64/neoverse_n2.S
index 5861dec..dbf5941 100644
--- a/lib/cpus/aarch64/neoverse_n2.S
+++ b/lib/cpus/aarch64/neoverse_n2.S
@@ -428,6 +428,30 @@
b cpu_rev_var_ls
endfunc check_errata_2388450
+/* -------------------------------------------------------
+ * Errata Workaround for Neoverse N2 Erratum 2743089.
+ * This applies to revisions <= r0p2 and is fixed in r0p3.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * -------------------------------------------------------
+ */
+func errata_n2_2743089_wa
+ mov x17, x30
+ bl check_errata_2743089
+ cbz x0, 1f
+
+ /* dsb before isb of power down sequence */
+ dsb sy
+1:
+ ret x17
+endfunc errata_n2_2743089_wa
+
+func check_errata_2743089
+ /* Applies to all revisions <= r0p2 */
+ mov x1, #0x02
+ b cpu_rev_var_ls
+endfunc check_errata_2743089
+
func check_errata_cve_2022_23960
#if WORKAROUND_CVE_2022_23960
mov x0, #ERRATA_APPLIES
@@ -576,6 +600,12 @@
mrs x0, NEOVERSE_N2_CPUPWRCTLR_EL1
orr x0, x0, #NEOVERSE_N2_CORE_PWRDN_EN_BIT
msr NEOVERSE_N2_CPUPWRCTLR_EL1, x0
+#if ERRATA_N2_2743089
+ mov x15, x30
+ bl cpu_get_rev_var
+ bl errata_n2_2743089_wa
+ mov x30, x15
+#endif /* ERRATA_N2_2743089 */
isb
ret
endfunc neoverse_n2_core_pwr_dwn
@@ -607,6 +637,7 @@
report_errata ERRATA_N2_2326639, neoverse_n2, 2326639
report_errata ERRATA_N2_2376738, neoverse_n2, 2376738
report_errata ERRATA_N2_2388450, neoverse_n2, 2388450
+ report_errata ERRATA_N2_2743089, neoverse_n2, 2743089
report_errata WORKAROUND_CVE_2022_23960, neoverse_n2, cve_2022_23960
report_errata ERRATA_DSU_2313941, neoverse_n2, dsu_2313941
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 2d7ccc0..b1f7d27 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -467,10 +467,6 @@
# applies to all revisions <= r4p1 of the Neoverse N1 cpu and is still open.
ERRATA_N1_2743102 ?=0
-# Flag to apply erratum 2002655 workaround during reset. This erratum applies
-# to revisions r0p0 of the Neoverse-N2 cpu, it is still open.
-ERRATA_N2_2002655 ?=0
-
# Flag to apply erratum 1618635 workaround during reset. This erratum applies
# to revision r0p0 of the Neoverse V1 cpu and was fixed in the revision r1p0.
ERRATA_V1_1618635 ?=0
@@ -587,6 +583,10 @@
# still open.
ERRATA_A710_2768515 ?=0
+# Flag to apply erratum 2002655 workaround during reset. This erratum applies
+# to revisions r0p0 of the Neoverse-N2 cpu, it is still open.
+ERRATA_N2_2002655 ?=0
+
# Flag to apply erratum 2067956 workaround during reset. This erratum applies
# to revision r0p0 of the Neoverse N2 cpu and is still open.
ERRATA_N2_2067956 ?=0
@@ -635,6 +635,10 @@
# to revision r0p0 of the Neoverse N2 cpu, it is fixed in r0p1.
ERRATA_N2_2388450 ?=0
+# Flag to apply erratum 2743089 workaround during during powerdown. This erratum
+# applies to all revisions <= r0p2 of the Neoverse N2 cpu, it is fixed in r0p3.
+ERRATA_N2_2743089 ?=0
+
# Flag to apply erratum 2002765 workaround during reset. This erratum applies
# to revisions r0p0, r1p0, and r2p0 of the Cortex-X2 cpu and is still open.
ERRATA_X2_2002765 ?=0
@@ -1123,10 +1127,6 @@
# Process ERRATA_N1_2743102 flag
$(eval $(call assert_boolean,ERRATA_N1_2743102))
$(eval $(call add_define,ERRATA_N1_2743102))
-#
-# Process ERRATA_N2_2002655 flag
-$(eval $(call assert_boolean,ERRATA_N2_2002655))
-$(eval $(call add_define,ERRATA_N2_2002655))
# Process ERRATA_V1_1618635 flag
$(eval $(call assert_boolean,ERRATA_V1_1618635))
@@ -1240,6 +1240,10 @@
$(eval $(call assert_boolean,ERRATA_A710_2768515))
$(eval $(call add_define,ERRATA_A710_2768515))
+# Process ERRATA_N2_2002655 flag
+$(eval $(call assert_boolean,ERRATA_N2_2002655))
+$(eval $(call add_define,ERRATA_N2_2002655))
+
# Process ERRATA_N2_2067956 flag
$(eval $(call assert_boolean,ERRATA_N2_2067956))
$(eval $(call add_define,ERRATA_N2_2067956))
@@ -1288,6 +1292,10 @@
$(eval $(call assert_boolean,ERRATA_N2_2388450))
$(eval $(call add_define,ERRATA_N2_2388450))
+# Process ERRATA_N2_2743089 flag
+$(eval $(call assert_boolean,ERRATA_N2_2743089))
+$(eval $(call add_define,ERRATA_N2_2743089))
+
# Process ERRATA_X2_2002765 flag
$(eval $(call assert_boolean,ERRATA_X2_2002765))
$(eval $(call add_define,ERRATA_X2_2002765))